The X-ray spectrum and variability of the Seyfert 2 Galaxy NGC7172

Details The X-ray spectrum and variability of the Seyfert 2 Galaxy NGC7172 The X-ray spectrum and variability of the Seyfert 2 Galaxy NGC7172

1998-03-13

arxiv.org/abs/astro-ph/9803151v1

Astronomy and Astrophysics

Astrophysics

7 pages, Latex, 11 Postscript figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.1998.01702.x

We present evidence of flux variability, on both short (hours) and long (months) time scales of the Seyfert 2 galaxy NGC 7172. These results are based on the ASCA observation of NGC 7172 performed on May 1996. The source was detected at a rather low flux level, about 3 times fainter than its usual state (including one year before, when it was also observed by ASCA). The source also varied by about 30 percent during the observation, confirming the presence of a type 1 nucleus in its center. However, its spectrum appears to be flatter than the typical Seyfert 1 spectrum (in agreement with findings on other Seyfert 2's), posing problems for the unification model unless complex absorption is invoked.

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